android的sqlite怎么查询数据
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这个很简单的：
//打开或创建test.db数据库
SQLiteDatabasedb = openOrCreateDatabase("test.db", Context.MODE_PRIVATE, null);
//创建person表
db.execSQL("DROPTABLE IF EXISTS person");
db.execSQL("CREATE TABLE person (_idINTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR, age SMALLINT)");
//插入数据
Personperson = new Person();
person.name= "john";
person.age = 30;
db.execSQL("INSERT INTO person VALUES(NULL, ?, ?)",new Object[]{person.name, person.age});
//读取数据
Cursor c = db.rawQuery("SELECT* FROM person WHERE age >= ?", new String[]{"33"});
while (c.moveToNext()) {
int _id = c.getInt(c.getColumnIndex("_id"));
String name = c.getString(c.getColumnIndex("name"));
int age = c.getInt(c.getColumnIndex("age"));
Log.i("db", "_id=>" + _id + ", name=>" + name + ", age=>" + age);
}
c.close();
//关闭当前数据库
db.close();
//打开或创建test.db数据库
SQLiteDatabasedb = openOrCreateDatabase("test.db", Context.MODE_PRIVATE, null);
//创建person表
db.execSQL("DROPTABLE IF EXISTS person");
db.execSQL("CREATE TABLE person (_idINTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR, age SMALLINT)");
//插入数据
Personperson = new Person();
person.name= "john";
person.age = 30;
db.execSQL("INSERT INTO person VALUES(NULL, ?, ?)",new Object[]{person.name, person.age});
//读取数据
Cursor c = db.rawQuery("SELECT* FROM person WHERE age >= ?", new String[]{"33"});
while (c.moveToNext()) {
int _id = c.getInt(c.getColumnIndex("_id"));
String name = c.getString(c.getColumnIndex("name"));
int age = c.getInt(c.getColumnIndex("age"));
Log.i("db", "_id=>" + _id + ", name=>" + name + ", age=>" + age);
}
c.close();
//关闭当前数据库
db.close();
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